NHTSA Complaint #11429998 — 2012 FORD F-350

I believe this is now the 3rd occurrence for me within the last two weeks of what has been termed by other owners as the "death wobble". Two incidents have occurred on "bumpy" roads, though one was just a bumpy interstate. The interstate, while a bumpy, I wouldn't imagine would have been bumpy enough to constitute a poor road condition, travel conditions were pulling about 12,000 lb 5th wheel camper and I was going probably between 55-60mph. The next two occurrences happened truck only. The second occurrence, was a back road and probably the "bumpiest" road of them all, probably going 45-50 mph, so not so bumpy that I had to be going super slow. The third occurrence was on a smooth road and I did hit a "bump" which probably wasn't much more than a crack in the road traveling at probably 50-60 mph. I experienced the wobble. Each time, it has been scarier than the last and it required me to slow down significantly, while I dont know the exact amount, many people describing under 20 mph feels about right, however, the 3rd occurrence required a complete stop before the shaking int he steering wheel was gone. I have completed a number of checks, tire tread is still good, the balance feels appropriate at highway speeds. I think my biggest concern here, is that this is a common issue and there appears to be no common reasons or even a short list of probably causes based on my doling around the internet. I am sure I am about to spend several thousand for mechanics to attempt solutions, but I believe it's worth adding my name to the list of this issue.